Paleobiology, particularly the Cambrian explosion, UCLA.
Paleoecology, Virginia Tech (emeritus professor).
Paleobiology and paleoecology, Hofstra University.
Paleozoic marine invertebrate trace-fossils in Brazilian basins; Universidade Federal do Rio de Janeiro.
Paleobiology, University of Wisconsin.
Evolutionary paleobiology, University of California-Berkeley.
Invertebrate paleobiology, Virginia Tech.
Invertebrate paleobiology (especially echinoderms), University of Cincinnati.
Bryozoan evolution, the Field Museum.
Evolutionary paleobiology and paleoecology, University of Cincinnati.
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